Method and system of automatically adjusting light intensity of a lighting fixture having multiple emitters

Abstract

A system for automatically adjusting light intensity of a lighting fixture having multiple emitters, includes a power supply for supplying at least one current source to multiple emitters, at least one first emitter capable of emitting light of a first wavelength, at least one second emitter capable of emitting light of a second wavelength and a luminous intensity adjusting circuit for adjusting light intensity of the at least one first emitter. Particularly, the luminous intensity adjusting circuit stabilizes a first current distributed from a feeding current of the at least one current source and the multiple emitters collectively emit light at a predefined variable light-intensity.

The invention claimed is: 
     
       1. A system for automatically adjusting light intensity of a lighting fixture having a plurality of emitters, said system comprising:
 a power supply for supplying at least one current source to said plurality of emitters; 
 at least one first emitter capable of emitting light of a first wavelength; 
 at least one second emitter capable of emitting light of a second wavelength; and 
 a control circuit for increasing share of a first current distributed from a feeding current of said at least one current source through said at least one first emitter and decreasing share of a second current distributed from said feeding current of said at least one current source through said at least one second emitter, wherein said control circuit comprises an inlet port and an outlet port, said control circuit being connected to said at least one current source at said inlet port to receive said feeding current, and said outlet port of said control circuit being connected to said interconnecting point of said at least one first emitter and at least one second emitter, 
 wherein said control circuit comprises:
 a resistance means connected to said at least one second emitter for providing bias voltage to a switching means, wherein said switching means being conductive when maximum input voltage is provided by said at least one current source and being less conductive when decreased input voltage is provided by said at least one current source; and 
 another switching means being conductive when decreased input voltage is provided by said at least one current source to said switching means and being non-conductive when maximum input voltage is provided by said at least one current source to said switching means; 
 
 wherein said plurality of emitters collectively emit light at a predefined variable light-intensity depending upon at least one level of a feeding current supplied by said at least one current source. 
 
     
     
       2. The system as claimed in  claim 1 , wherein said plurality of emitters comprises said at least one first emitter and said at least one second emitter. 
     
     
       3. The system as claimed in  claim 1 , wherein said at least one second emitter is connected to said at least one first emitter in a parallel arrangement. 
     
     
       4. The system as claimed in  claim 1 , wherein a luminous intensity adjusting circuit is configured for stabilizing said first current flowing through said at least one first emitter at an original level independent of any variation in said feeding current supplied by said at least one current source. 
     
     
       5. The system as claimed in  claim 1 , wherein said second current distributed from said feeding current follows a variation of said feeding current supplied by said at least one current source. 
     
     
       6. The system as claimed in  claim 1 , wherein said at least one first emitter and at least one second emitter comprises at least one light emitting diode (LED). 
     
     
       7. A system for automatically adjusting light intensity of a lighting fixture having a plurality of emitters, said system comprising:
 a power supply for supplying at least one current source to said plurality of emitters; 
 at least one first emitter capable of emitting light of a first wavelength and at least one second emitter capable of emitting light of a second wavelength, wherein said at least one first emitter and at least one second emitter are connected at an interconnecting point in a series arrangement; and 
 a control circuit for increasing share of a first current distributed from a feeding current of said at least one current source through said at least one first emitter and decreasing share of a second current distributed from said feeding current through said at least one second emitter, wherein said control circuit comprises an inlet port and an outlet port, said control circuit being connected to said at least one current source at said inlet port to receive said feeding current, and said outlet port of said control circuit being connected to said interconnecting point of said at least one first emitter and at least one second emitter, 
 wherein said control circuit comprises:
 a reference voltage source controller for inducing said feeding current; 
 a first switching means being conductive when maximum input voltage is provided by said at least one current source and being non-conductive when decreased input voltage is provided by said at least one current source; 
 a second switching means being conductive when decreased input voltage is provided by said at least one current source and being non-conductive when maximum input voltage is provided by said at least one current source; and 
 a first resistance means coupled to said second switching means for providing current flows through said interconnecting point of said at least one first emitter and said at least one second emitter, and 
 
 wherein said plurality of emitters comprising said at least one first emitter and said at least one second emitter collectively emit light at a predefined variable light-intensity depending upon at least one level of said feeding current supplied by said at least one current source. 
 
     
     
       8. The system as claimed in  claim 7 , wherein said at least one first emitter is connected to earth and said at least one second emitter is electrically connected to said at least one current source for receiving said second current distributed from said feeding current. 
     
     
       9. The system as claimed in  claim 7 , wherein said reference voltage source controller comprises one or more voltage reference devices. 
     
     
       10. The system as claimed in  claim 9 , wherein said voltage reference devices include at least one Zener diode. 
     
     
       11. The system as claimed in  claim 7 , wherein said first switching means and said second switching means comprise a transistor. 
     
     
       12. The system as claimed in  claim 7 , wherein said control circuit comprises:
 a second resistance means connected to said at least one second emitter for providing bias voltage to a third switching means, wherein said third switching means being conductive when maximum input voltage is provided by said at least one current source and being less conductive when decreased input voltage is provided by said at least one current source; and 
 a fourth switching means being conductive when decreased input voltage is provided by said at least one current source to said third switching means and being non-conductive when maximum input voltage is provided by said at least one current source to said third switching means. 
 
     
     
       13. The system as claimed in  claim 12 , wherein a third resistance means is connected to said third switching means and a fourth resistance means is connected to said at least one first emitter for providing flow of said feeding current to said at least one first emitter. 
     
     
       14. The system as claimed in  claim 12 , wherein said third switching means and said fourth switching means comprise a transistor. 
     
     
       15. A method of automatically adjusting light intensity of a lighting fixture having a plurality of emitters, said method comprising the steps of:
 providing a power supply for supplying at least one current source to said plurality of emitters; 
 receiving a feeding current from said at least one current source; 
 distributing said feeding current to at least one first emitter and at least one second emitter; 
 connecting a luminous intensity adjusting circuit to said at least one first emitter for adjusting light intensity of said at least one first emitter; 
 stabilizing a first current flowing through said at least one first emitter, wherein said first current is distributed from said feeding current of said at least one current source; 
 emitting light at a predefined variable light-intensity by said plurality of emitters collectively depending upon at least one level of said feeding current supplied by said at least one current source; 
 lowering said at least one level of said feeding current supplied by said at least one current source; 
 stabilizing said first current flowing through said at least one first emitter via said luminous intensity adjusting circuit; 
 maintaining said first current flowing through said at least one first emitter at an original level independent of any variation in said feeding current supplied by said at least one current source; 
 emitting aggregated amount of light of reduced light intensity by collecting a first wavelength of said at least one first emitter and a second wavelength of said at least one second emitter; and 
 shifting said reduced light intensity of said aggregated amount of light to a first value wavelength. 
 
     
     
       16. The method as claimed in  claim 15 , said first value wavelength comprises a red portion of a visible light spectrum. 
     
     
       17. The method as claimed in  claim 15 , wherein said plurality of emitters comprises said at least one first emitter and said at least one second emitter, said at least one second emitter is connected to said at least one first emitter in a parallel arrangement and, said at least one first emitter and at least one second emitter comprises LEDs. 
     
     
       18. The method as claimed in  claim 15 , wherein said feeding current distributes said first current to said at least one first emitter and a second current to said at least one second emitter. 
     
     
       19. A method of automatically adjusting light intensity of a lighting fixture having a plurality of emitters, said method comprising the steps of:
 providing a power supply for supplying at least one current source to said plurality of emitters; 
 receiving a feeding current from said at least one current source; 
 distributing said feeding current to at least one first emitter and at least one second emitter; 
 connecting said at least one first emitter and said at least one second emitter at an interconnecting point in a series arrangement; 
 connecting a control circuit to said interconnecting point of said at least one first emitter and at least one second emitter; 
 emitting light at a predefined variable light-intensity by said plurality of emitters collectively depending upon at least one level of said feeding current supplied by said at least one current source; 
 inducing a decreased feeding current by a reference voltage source controller; 
 providing a decreased input voltage by said at least one current source to a first switching means and a second switching means; 
 coupling a first resistance means to said second switching means for providing current flow through said interconnecting point of said at least one first emitter and said at least one second emitter; 
 generating a larger amount of said feeding current and said feeding current flows through said first resistance means to said at least one first emitter via said interconnecting point; 
 increasing a relative part of a light emitted by said at least one first emitter; 
 emitting aggregated amount of light of reduced light intensity by collecting a first wavelength of said at least one first emitter and a second wavelength of said at least one second emitter; and 
 shifting said reduced light intensity of said aggregated amount of light to a first value wavelength. 
 
     
     
       20. The method as claimed in  claim 19 , said method further comprises the steps of:
 connecting a second resistance means to said at least one second emitter for providing bias voltage to a third switching means; 
 connecting a third resistance means to said third switching means and a fourth resistance means to said at least one first emitter for providing flow of said feeding current to said at least one first emitter; 
 providing a decreased input voltage by said at least one current source to a third switching means and a fourth switching means; 
 generating a larger amount of said feeding current and said feeding current flows through said fourth resistance means to said at least one first emitter via said interconnecting point; 
 increasing a relative part of a light emitted by said at least one first emitter; 
 emitting aggregated amount of light of reduced light intensity by collecting a first wavelength of said at least one first emitter and a second wavelength of said at least one second emitter; and 
 shifting said reduced light intensity of said aggregated amount of light to a first value wavelength. 
 
     
     
       21. The method as claimed in  claim 19 , said control circuit increases share of a first current distributed from said feeding current of said at least one current source through said at least one first emitter and decreases share of a second current distributed from said feeding current through said at least one second emitter. 
     
     
       22. The method as claimed in  claim 19 , wherein said control circuit comprises an inlet port and an outlet port, said control circuit being connected to said at least one current source at said inlet port to receive said feeding current, and said outlet port of said control circuit being connected to said interconnecting point of said at least one first emitter and at least one second emitter. 
     
     
       23. The method as claimed in  claim 19 , said first value wavelength comprises a red portion of a visible light spectrum. 
     
     
       24. The method as claimed in  claim 19 , wherein said at least one first emitter is connected to earth and said at least one second emitter is electrically connected to said at least one current source for receiving said second current distributed from said feeding current. 
     
     
       25. The method as claimed in  claim 19 , wherein said at least one first emitter and at least one second emitter comprises LEDs.